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I want change the location of the tnsnames.ora file on our network to a share drive so that everyone can use the same one. I read that there is a TNS_ADMIN entry in the registry but I can't find it. How do I set this up. I want SQLPLus to look for the TNSNAMES.ORA file on my share drive by default. Thanks.

On NT?
right-click My Computer > Environment and set a system or user variable called TNS_ADMIN. This should point to the shared directory where you intend to place the network admin files (tnsname.ora, sqlnet.ora). No need to mess with the registry.